rendering complex backgrounds as single image

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basshole
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rendering complex backgrounds as single image

Post by basshole »

Someone on here recommended that a way to speed up rendering of movies was to take a background that has many shapes/layers, and when possible, rerender the whole thing as as single image, and replace the ASP generated bg with the image layer.

anyone have any advice as to the best way to go about doing this? File format (bmp, jpg, tiff, etc.)?

Resolution? My project will be 1920x1080, but of course sometimes you see the background in a wide shot, sometimes in a close up, and I need it to hold up when its zoomed in on.

Anything else? Thanks.
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Víctor Paredes
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Post by Víctor Paredes »

Personally I use png, it's a good and light format. Never use jpg or gif for serious work, that formats compress the images a lot. Never use bmp neither, it doesn't compress the image at all and files are always ridiculously huge.

About size, I recommend you at least the double of your final scene. But that depends of how much zoom you put on the background, it's your decision. Anyway, never put a background smaller than the project size.
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basshole
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Post by basshole »

Thanks. You say BMP doesn't compress at all. . .are the files, to the eye, higher quality than the compressed PNG? If there's no difference, I'll go with the smaller file size of course, but if PNG suffers noticeable degradation from BMP, that's another story.

I guess as far as rez goes, I'll go through each scene and figure out what the tightest zoom is, and do tests to see how big the image has to be to withstand that "focal length".

One more thing. You recommend PNG for the still image background, what about for my image sequences?
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slowtiger
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Post by slowtiger »

PNG is the format to go. It's the only one which reliably works with alpha channels. I use it for all files to be exchanged between programs, back and forth. The files are reasonably small, besides, if you work in HD, you must have plenty of disk space anyway.

(Some numbers: for a HD film of 5 minutes I had lots of separate scene files, BGs and props and stuff, which occupied about 25 GB.)
basshole
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Post by basshole »

Thanks. I already took the time to render out the intro to the movie (about 35 secs) in a BMP image sequence. If I leave this as is, and put it with the rest of the movie as PNG image sequences, think it'll be an isseue?
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Post by slowtiger »

There shouldn't be any visible difference as long as you use the same colour resolution (24 bit).
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